Egyptian chemist Zewail, Nobel prize-winner, dies at 70

PASADENA, Calif. (AP) — Ahmed Zewail, a science adviser to President Barack Obama who won the 1999 Nobel Prize for his work on the study of chemical reactions over immensely short time scales, has died at age 70. Zewail’s death on Tuesday was announced by the California Institute of Technology in Pasadena, Calif., where he […]